body {
    font-family: "微软雅黑", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #F9FAFB;
    color: #333;
}

h2 {
    text-align: center;
    font-size: 24px;
    color: #4A90E2;
    margin-bottom: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #4A90E2;
    color: white;
    padding: 10px 20px;
    font-size: 14px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 5px 10px;
    border: 1px solid white;
    border-radius: 4px;
    background-color: transparent;
    transition: all 0.3s ease;
}

.header a:hover {
    background-color: white;
    color: #4A90E2;
}

.main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    border: 1px solid #D1E4F6;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#main-content {
    text-align: center;
    font-size: 16px;
    color: #555;
    line-height: 1.6;
}

.clock {
    font-size: 22px;
    font-weight: 600;
    color: #0D47A1;
    text-align: center;
    margin-bottom: 25px;
    background-color: #E3F2FD;
    padding: 10px 20px;
    border-radius: 8px;
    display: inline-block;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

.clock:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease-in-out;
}

.banner {
    text-align: center;
    margin: 30px 0;
}

.banner img {
    max-width: 90%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.banner img:hover {
    transform: scale(1.08);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.welcome-tip {
    text-align: center;
    font-size: 40px;
    color: #2E3A59;
    margin-top: 40px;
    font-style: 宋体;
    background: linear-gradient(90deg, #E0F7FA, #E3F2FD);
    padding: 15px 30px;
    border-radius: 10px;
    display: inline-block;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
